We are used to thinking that going digital means going green. While that is true for some activities – for example, making a video call to the other side of the ocean is better than flying there – the situation is subtler in many other cases. For example, driving a small car to the movie theatre with a friend may have lower carbon emissions than streaming the same movie alone at home.
How do we reach this conclusion? Surprisingly, making these estimates is fairly complicated. This is due to two reasons: we do not have good data to start with, and even when we do, the comparison with other human activities is often difficult to make. In a September 2022 report, “Data Centres and Data Transmission Networks”, the International Energy Agency (IEA) stated:
